. >> something you can never the quite cal brate is the human emotional aspect of markets. >> i'm glad you raised that issue charlie because i'm just starting to write a economic. it's call the economytrics of human name. >> rose: so you do put numbers on. >> i don't know that yet. i know i can do it in a number of instances but whether i can do it in enough and when i finish the book i will know. >> rose: what have you learned. now that you have done all this study, what have you learned about the measurement? >> well, what i first started on is an extraordinary event. it's not that all the leading forecasters didn't know we were in a bubble at one point or another. that's not the issue. that's very easy to tell. the trick and the very difficult issue for forecasting is how can you pinpoint when the bubble breaks. but more importantly, what are the consequences of that. and this book attempting to attack those two questions was fundmental to how the economy functions. as far as i'm concerned, there's one critical issue which i think probably more than any other was, that was essential